$apikey = 'Your APIKEY';

$url = "https://api.value-domain.com/v1";
$path = "/servers";
$method = "GET";
$postfields = array();
$post_query = json_encode($postfields);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url . $path);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
if ($method!=='GET') {
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $post_query);
  curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);//FIXME use http version 1.1
}
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 120);

$headers = array();
$headers[] = "Content-Type: application/json";
if ($method!=='GET') {
  $headers[] = 'Content-Length: ' . strlen($post_query);
}
$headers[] = 'Authorization: Bearer ' . $apikey;
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

$response = curl_exec($ch);
if (curl_errno($ch)) {
  echo 'Connection Error: ' . curl_errno($ch) . ' - ' . curl_error($ch);exit;
}
$info = curl_getinfo($ch);

curl_close($ch);